I try to keep my FireFox plug-ins streamlined, but after testing Invisible Hand only this morning, I'm addicted to its unobtrusive, deal-finding prowess.

Say you want to buy a new Sharp LCD. You pick out a model on Amazon or Best Buy, and while you're inspecting the product page, a small drop-down may inform you that Buy.com (or one of 50 other comparison stores) has the television for 1% cheaper than where you were shopping.

It's not the only plug-in of its kind, and I was able to beat that tested deal pictured above by searching myself, but the visually quiet interface may keep you from uninstalling the thing by the end of the week.

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As an Amazon addict (on small purchases), I've basically sold my soul for convenience, accepting that 5 minutes of googling may have saved me 20 cents. But having the comparison shopping cruising in the background...we'll see whether or not I reassess that position (whether I'm cheaper than I am lazy). [Invisible Hand via Red Ferret via LifeHacker]